The real reasons for both have probably more to do with flash writes being slow and increasing the chances of running low on space. Probably more chances for th

The real reasons for both have probably more to do with flash writes being slow and increasing the chances of running low on space. Probably more chances for the CPU to go into thermal throttling, too. Not everyone has the latest hardware. Parallel downloads increase contention at all levels: CPU, Flash, FS, local network, ISP, server. Serial downloads make the store a better citizen.